magnetic rfid

Anyone have any design insight into a magnetic field coild the operates at UHF frequency, maybe 18 by 18 inches in size. 2 watts power handling, 5% bandwidth. How do you go about doing it?

I am trying to solve the same problem.
You can get the bandwidth by making a coil and deQ the coil with a resistor.
Lamda of RFID UHF is 33cm (13inches). That means it is very difficult to make a large magnetic antenna.
Maybe an array of small antennas?
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